反相悬浮聚合法制备AA-AMPS/HA/MMT复合吸水树脂及其性能的研究

Preparation of AA-AMPS/HA/MMT Composite Water Absorbent Resin by Inverse Suspension Polymerization and Its Properties

摘要: 本文采用反相悬浮聚合法，以丙烯酸(AA)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、腐植酸(HA-K)及膨润土(MMT)为主要原料，以环己烷为分散介质，Span80和Tween80为双分散剂，过硫酸钾KPS为引发剂，N,N-亚甲基双丙烯酰胺为交联剂，合成一种复合吸水树脂AA-AMPS/HA/MMT，并通过单因素法研究了膨润土添加量、交联剂、引发剂、中和度、温度等工艺条件对吸水树脂吸水性能的影响。结果表明：当原料的质量比为AA:AMPS:HA:MMT = 20:5:1:1.5，分散剂用量为7 wt%，中和度为65%，引发剂KPS占单体总量的0.96 wt%，交联剂MBA占单体总量的0.08 wt%，反应温度为67℃时，吸水树脂的吸水倍率最好，达到451 g/g。

Abstract: In this paper, the acrylic acid (AA), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), humic acid (HA) and bentonite (MMT) were used as the main raw materials; cyclohexane was used as the dispersion medium, and Span80 and Tween80 were used as the dispersant; potassium persulfate KPS as the initiator and N,N-methylenebisacrylamide as crosslinker were used to synthesize a composite water-absorbent resin AA-AMPS/HA/MMT by reversed-phase suspension polymerization. The effects of the addition of bentonite, crosslinker, initiator, neutralization and temperature on the water absorption properties of the water-absorbing resin were studied by single factor method. The results showed that when the mass ratio of raw materials was AA:AMPS:HA:MMT = 20:5:1:1.5, the amount of dispersant was 7 wt%; the degree of neutralization was 65%; and the initiator KPS accounted was 0.96 wt% of the total monomer; the cross-linking agent MBA accounts for 0.08 wt%, and when the reaction temperature is 67˚C, the water absorbing resin has the best water absorption ratio of 451 g/g.